package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;

@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {

        List<CategoryEntity> entities = baseMapper.selectList(null);
        List<CategoryEntity> level1Menus = entities.stream().filter(
                (categoryEntity) -> {
                    return categoryEntity.getParentCid() == 0;
                }
        ).peek((menu) -> menu.setChildren(getChildrens(menu, entities))).sorted((num1, num2) -> {
            return (num1.getSort() == null ? 0 : num1.getSort()) - (num2.getSort() == null ? 0 : num2.getSort());
        }).collect(Collectors.toList());

        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //检查单签删除的菜单，是否被占用
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> longs = cateParentPath(catelogId, paths);
        Collections.reverse(longs);
        return longs.toArray(new Long[longs.size()]);
    }

    private List<Long> cateParentPath(Long cateLongId, List<Long> paths) {
        paths.add(cateLongId);
        //收集节点id
        if (cateLongId != 0) {
            CategoryEntity byId = this.getById(cateLongId);
            return cateParentPath(byId.getParentCid(), paths);
        }
        return paths;
    }

    private List<CategoryEntity> getChildrens(CategoryEntity entity, List<CategoryEntity> all) {
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid().equals(entity.getCatId());
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((num1, num2) -> {
            return (num1.getSort() == null ? 0 : num1.getSort()) - (num2.getSort() == null ? 0 : num2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

}